Circuit Diagram Symbols - Programming Interactivity

Figure A.1, “Circuit notation” shows some of the most commonly
used symbols in electrical diagrams. Understanding the symbols will help you
interpret the diagrams in this book and the many schematic diagrams that you
might find on the web or in other books. It’s also useful if you want to
make your own diagrams for projects. You can find a more comprehensive list
at www.kpsec.freeuk.com/symbol.htm.

This excerpt is from Programming Interactivity .
With Programming Interactivity, you'll explore cutting-edge techniques for interaction design, and get the background and technical information you need to design, program, build, and troubleshoot your own projects. This book explains programming and electrical engineering basics, and introduces three freely available tools created
specifically for artists and designers: Processing, Arduino, and OpenFrameworks.